Insulated electrical conductor



(No Model.)

Patented Dec. Z0, 1887.v

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f UNITED STATES PATENT OEEICE.

ALBEBT KIsSEL, or SALEM, ASSIGNOB, To THE ADAMANTA MANUFAC- TUBrNc COMPANY, or BosToN, MASsAcHUSETTs.

INSULATED ELECTRICAL CONDUCTOR.

SPECIFICATION forming part of Letters Patent No. 375,295, dated December 20, 1887.

Application 'tiled September 5, 1887. SerialiNo. 248,829. (No model.)

To all whom it may concern:

Be it known that I, ALBERT KrssEL, of Salem, county of Essex, and State of Massachusetts, have invented an Improvement in Insulated Electrical Conductors, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention relates to an insulating covering for electric conductors, and has for its object to provide a durable and efficient yet cheap insulation, and one not readily affected by changes of temperature and inclement weather. l

In accordance with my invention I employ as the base or elementary ingredient of my improved insulating material artifici al,or, as it islcommerciall y known, Adamanta rubber,77 composed of resin, caustic alkaline earth, oil, and sulphur, and prepared in accordance with my United States Patent No. 350,459, granted to me October 5, 1886.

The Adamanta rubber referred to will preferably be used with a .fibrous material, such as cotton cloth, asbestus, or other like material commonly employed with other sub stances as an insulating covering for electric wires; or the'said rubber may be used alone. The Adamanta rubber in a softened or dissolved state may be applied to the wire alone or coated with a fibrous material by drawing the said wire through a bath of the Adamanta rubber.

I prefer to have the wire wound or otherwise covered with fibrous material, asa greater body is thus obtained, the softened or dissolved Adamanta rubber permeating the fibrous material and forming an effective insulation for the said wire, the Adamanta rubber nOt being readily affected by changes in temperature and inclement weather.

My invention therefore consists,essentially, of an electric conductor having aninsulating covering of Adamanta rubber, substantially as will be described.

Figure 1 represents a wire provided with my improved insulating covering; Fig. 2, a section of Fig. 1 online :v x; Fig. 3, a modiication to be referred to; and Fig. 4, a cable composed of a number of conductors insulated in accordance with my invention.

rIhe core or wire c, of copper or other usual conducting material, is herein shown in Fig. l as provided with a covering, a', of cotton cloth, asbestus, or other fibrous material, the said covering being itself impregnated with and covered by Adamanta rubber b, which in practice may be applied in a softened or dissolved state by drawing the wire covered with fibrous material through a bath of Adamanta rubber.

I prefer to apply the Adamanta rubber' to l the wire, as described; but good results may be obtained by applying the Adamanta rubber :in the form of a thin strip or tape, and so, also, the brous material a may be omitted and the Adamanta rubber applied directly to the naked wire, as shown in Fig. 3.

I am aware that rubber and compounds of rubber have been employed heretofore for insulating electric wires, but owing to the rapid oxidation of the rubber, which renders it brittle and non-impervious to water, the use Of rubber has not been considered a success.

My improved rubber, being Water and acid proof and not easily oxidizable, possesses many advantages, and is especially applicable in many instances where ordinary rubber insulation would prove nnavailing and worthless.

It is evident, also, that the fibrous covering may be first immersed in the bath of softened or dissolved rubber and then wound upon the wire.

Referring to Fig. 4, I have shown a cable composed ofveinsulatingconductorsgrouped together and enveloped by a covering, b', of Adamanta rubber or fibrous material impregnated with Adamanta rubber.

I claiml. As anew article of manufacture, an electric conductor having an insulating covering of Adamanta rubber, substantially as described.

2. An electric conductor comprising a central core or wire, a, a covering', c', of fibrous material, and an outer covering or layer, In testimony whereof I have signed my b, of Adamnnta rubber, substantially as dename to this specification in the presence of 1o scribed. two subscribing Witnesses.

3. A cable composed of a plurality of Wires a, each having a covering of Adamanta. rub,- ALBERT KISSEL ber, and an outer covering of Adamant@ rub- XVitnesses: ber, b', enveloping the said group of oonduet- JAS. H. CHURCHILL, ors, substantially as described. B. DEWAR. 

